Evaporator.



P. B. SADTLER.

EVARORATOR. APPLICATION riLED Nov. 19. |914.

1346.939, Y Patented N0v.20,1917.

UNITED STATES PATENT OFFICE.

PHILIP B. SADTLER, 0F CHICAGO, ILLINOIS.

EvAronA'ron. y

To all whom it may concern.'

Be it known that I, PHILIP B. SADTLER, a citizen of the United States, .residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Eva orators, of which the following is a speci cation.

My invention relates to improvements 1n and has for its particular obthat will most efficient y concentrate the entire liquor body to the sired degree.

Furthermore, also it is diiiicult to evacuate `the evaporator of its high-density contents 'after full concentration, on account of the character ofthe material aforesaid.

The im rovement wrought by my invention provides among other advantages, for eectlvely creating and maintaining circulation and insuring discharge of the finished product. .4 v

In the drawing wherein I have illustrated a practical embodiment of my invention, the

single view represents the side elevation of a. circular evaporator with parts broken embodying my invention comprises in' its body away sufficiently to illustrate interior construction. It will be understood that in its broader aspects my invention is lnot limited to the form of evaporator that is herein shown, but theV single form of construction herein illustrated is selected for purposes of disclosure of a` commercially fadvantageous structure.- Y `1 Y One suitable construction of evaporator'for 10a cylindrical portion 11, avapor dome 12 (usually maintained under partial vacuum), opening to the vapor outlet 13,l and a base cone 1-1, this casing structure inclosing supporting a heating structure, shown as a steam chest 15 in the form of a drum having a peripheral wall 16`and top and bottom heads 17 and 18, v,through whichheads the liquor tubes 19 open'vertically. In" this form Specification of Letters Patent.

and

. ratenteauoy. 2o, 1917.

'Application led November 19, 1914. Ser-iallNo. 872,950.

of construction, natural liquor circulation would be up through the tubes 19,'a1`1d vdown around the periphery of the chest. v

I prefer that, in such a type of evaporator the steam vchest be positioned centrally in the casing and supported by lugs 21 secured to the peripheral Wall 16 of the chest to' bear on and be bolted tolugs 22 that may conveniently be cast integrally `with the wall 11 of the casing. Steam may be led into the interior of thesteam chest through the inlet pipe 23; carrying 'an exterior'delector or hood 23', 'the water of condensation isl drained out through drain 24, and an air relief pipe 25 may be provided, opening from the top and ,other instruments, piping valves, and the like, are provided' in connection with these instrumentalities in usual fashion,but with thesemy present invention has no especial concern.

For effecting proper circulation of the liquor through the path of its heat-circulation tendency and insuring its-adequate. removal upon completion of the concentration, I provide, in cooperative relation, positive liquor circulating means and drainage` structure. The casing 10 is preferably supported at a suitable elevation on pillars28. and from the bottom of the liquor body-in this case the bottom of the cone 14e-a flowntaking pipe`29 leads to the eye of a pum '30, illustrated conventionally as a centri ugal pumpy placed below the casing and n of the steam chest. It will be understood, of course, that suitable gages driven from the pulley 3l, The pump outlet 32 has an uptake connection 33, valved as at 34, leading to the commencement point, so to speak, where the heat-eii'ected circulation tendency takes eiect, a lateral connection 35 extending diagonally through the wall of cone 14 and into a conical` distributing head 36 thatis bolted to the lsteam chest 15 so as to provide a peripherally closed chamber 37 below the vertical tubes 19. Obviously the liquor handled by the pump 30 will be forced up through the iping, 33-35 for distribution in the cham er 37 to the tubes'19, and after traversing said tubes will return around the steam chest to the pipe 29'and back to the eye of-lthe pump, asl indicated by arrows. The hood 23', of course, tends'to prevent liquor from splashing up into dome 12. -A suitably valved supply pipe 3S'may lead to the eye of the pump to supply fresh liquor as required.

At a suitable point in the uptake 33, preferably below the valve 34, an outlet pipe for the finished product, controlledby a valve 4l, is provided. This is preferably supplemented by a by-pass pipe 42 effecting connection between pipes 33 and 40 beyond the respective valves 34 and 4l, and itself controlled by a valve 43.

It will be apparent that in an evaporator of the character illustrated thenatural circulation tendency will be in the same direction as the arrows, and the action of the pump enhances and makes positive this circulation tendency with minimum expenditure of power in pumping, so that very dense liquors may be handled in themachine with assurance of that continuous and positive liquor flow that most effectively vsecures uniform concentration. IVhen the treatment has been carried forward to the desired extent, valve 41 may be opened to permit evacuation of the evaporator contents at the desired rate, and the finished product, pumped against the opposition of the head of liquor in the evaporator, will iow steadily from the eduction pipe 40 while circulation is being maintained. In practice I find it to be feasible to pump out all save a very small quantity of material that tends to remain in the distributing chamber 37, and, when the evaporator has been emptied as far as may be by pumping, valve 34 may be closed and valve 43 opened for direct drainage of this small residual liquor body into the eduction pipe.

I have found that by my invention I am able to concentrate in a liquor tube evaporator, liquors that it has been considered, heretofore, practical to concentrate only in drying pans, and it will be apparent that the large capacity and the facility of operation Otan evaporator as herein described enables such concentration to be. made with minimum expense and high eiiiciency.

While I have herein described in some detail a particular embodiment of my invention, it will be understood that many changes might be made inthe embodiment Without departure f' )m the spirit of within the scope of the appended claims.

Having described my invention, what I claim is 1. In an evaporator the combination of a casing, a steam chesttherein having liquor circulation tubes, a chambervinto which lead the lower ends of the tubes, a pump, piping connections between one side of said pump and the casing and between the other side of said pump and the chamber and a valved outlet intermediate the pressure side of said pump and the chamber.

my invention,

naaepea 2. In an evaporator the combination of a casing, a steam chest therein having liquor circulation tubes, a pump, piping connections between one side of said pump and the casing and between the other side of said pump and the liquor tubes, a valved outlet on the pressure side of said pump, and a by-pass from the liquor tubes to the outlet around the outlet valve.

In an evaporator the combination of the shell, having a tapering bottom, a vertical steam drum therein having vertical liquor tubes, a distributing head coperating with the lower end of said drum to form the distributing chamber 37, a pump, and piping connections between the tapering bottom of the casing and the pump and between the pump and the chamber 37.

4. In an evaporator the combination of the shell, having a tapering bottom, a vertical steam drum therein having vertical liquor tubes, a distributing head coperating with the lower end of said drum to form the distributing chamber 37, a pump, piping connections between the tapering bottom of the casing and the pump and between the pump and the chamber 37 and a valved outlet between the pressure side of the pump and said chamber 37.

5. In an evaporator the combination of the shell, having a tapering bottom, a vertical steam drum therein having vertical liquor tubes, a distributing head coperating with the lower end of said drum to form the distributing chamber 37, a pump, piping connections between the tapering bottom of the casing and the pump and between the pump and the chamber 37, a valved outlet between the pressure side of the pump and said chamber 37 and a valved by-pass from said chamber 37 around the valvefor said outlet pipe.

6. In an evaporator the combination of a steam chest having liquor circulating passages therein, a chamber into which lead the lower ends of the liquor circulating passages, an inlet leading intothe bottom of the chamber, a casing inclosing the steam chest and chamber, an outlet for the casing at the bottom thereof below the `inlet to the chamber, a duct connecting the outlet of the casing with the inlet to thechamber, and means in said duct to stimulate liquor circulation.

In testimony whereof I hereunto set my hand in the presence of two subscribing witnesses.

PHILIP B. SADILER. In the presence of Gro. T. MAY, Jr., Maier I". ALLEN. 

